But the dog started barking once the cops from the 46th Precinct arrived around 5:30 a.m. When Rosado opened her door to see what was happening, Spike slipped into the hallway — where the cop was standing near 16-year-old neighbor Serena Santiago.

The video captured the officer shooting at the doomed pooch from about 3 feet away. The cop fired almost immediately, as he scurried down a few stairs.

The cop who fired the shot was taken to an area hospital for tinnitus — but Santiago had little sympathy for the shooter.

"I heard the cops had to go to the hospital for ringing ears, but my daughter has to go to psychiatric therapy for this," she said of her daughter.

Rosario opened the door to see what the problem was when the officers were talking to a neighbor, and that's when Spike slipped out. She screamed at the cops, "He's friendly! He's friendly!"

Rosado has already filed a notice of claim for a possible lawsuit against the city. She was also planning to file a grievance against the officers with the city's Civilian Complaint Review Board.

"Did the NYPD learn nothing from Peter Liang?" asked Rosado family attorney David Thompson, referring to the rookie cop convicted of shooting an unarmed man in a darkened Brooklyn stairwell in November 2014. "Don't fire your damn gun in an apartment house stairwell unless you absolutely, positively, 100% got to do it."

Rosado claims the NYPD killed her legless pet cat, Bebe, about six years ago, breaking the kitty's neck during a search of another Bronx apartment.

The startling video captured the cop who shot the dog sheepishly walking down the stairs. He re-emerges to poke his head out from the staircase.

Rosado has already filed a notice of claim about a lawsuit against the city. She was also planning to file a grievance against the officers with the city’s Civilian Complaint Review Board on Thursday. (Provided to New York Daily News)

Rosado's panicked family is seen racing out to cradle the dying Spike, whose tail kept wagging as the life seeped from the pet. Hazel, another family dog, walked from the apartment, as if to check on Spike, but was quickly ushered back inside the home. Rosado, wearing only her undergarments, slipped down the stairs, her feet slick with the dog's blood. She took a few swings at a cop and was restrained by police. Rosado wasn't charged.

The officers were dispatched to the E. 183rd St. building after Rosado's neighbor said a former boyfriend — the subject of an order of protection — tried to come inside. He was long gone by the time police arrived.

According to NYPD policy, cops can shoot at animals "only to defend themselves or others from threat of physical injury, or death." They are only allowed to use their weapons "as a last resort to stop an animal attack."

In 2014 — the last time the NYPD put out its firearm discharge report — cops had shot at 18 animals, most of them dogs. It's one fewer than the 19 in 2013. In 2011, 36 animals were shot by police during animal attacks, officials said.